Note: Retrieving the Adapter instance
If you choose not to make the adapter instantiated with this resource the default table adapter, how do you retrieve the adapter instance?
As with any resource plugin, you can fetch the DB resource plugin from your bootstrap:

$resource = $bootstrap->getPluginResource('db');

Once you have the resource object, you can fetch the DB adapter using the getDbAdapter() method:

$db = $resource->getDbAdapter();

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So i expect when i override the Application Bootstrap _initDb() function with those: